EP 0368792 A2 19900516 - Determining position with light.
Title (en)
Determining position with light.
Title (de)
Positionsmessung durch Licht.
Title (fr)
Mesure de position avec lumière.
Publication
Application
Priority
US 26284888 A 19881026
Abstract (en)
The invention teaches determining position with light by providing amplitude modulated input light at an input light port of an optical cavity having a variable length dimension, detecting light at an output light port of the optical cavity and varying the frequency of amplitude modulation until a peak is detected. The maximizing frequency can then be related to the length of the cavity. The cavity may comprise an optical fiber inserted into a variable length cavity filled with a liquid having an index of refraction which matches that of the fiber. Mirrors may be placed at either end of the cavity.
IPC 1-7
IPC 8 full level
G01D 5/26 (2006.01)
CPC (source: EP US)
G01D 5/268 (2013.01 - EP US)
Designated contracting state (EPC)
FR GB IT SE
DOCDB simple family (publication)
EP 0368792 A2 19900516; EP 0368792 A3 19920311; CA 2001368 A1 19900426; IL 92113 A0 19900712; IL 92113 A 19920329; US 5075545 A 19911224
DOCDB simple family (application)
EP 89630193 A 19891026; CA 2001368 A 19891024; IL 9211389 A 19891025; US 26284888 A 19881026